It's a pretty steep price for a single piece of gear - it's not a pay once, buy whatever you want quality. If you want multiple pieces of restricted gear, you have to buy the quality for each piece. To be sure, there are some really good options (Pain Editor, anyone?), but other choices one can make that probably aren't worth the karma.
It also helps a bit in balancing the non-Awakened characters. (For example, an adept can start with Improved Reflexes at rating 3, but prior to Restricted Gear, neither of the rating 3 reflex augmentations could be purchased.)